Improvement in spring rocking-chairs



P. C. INGERSOLL, Improvement in Sp'in'gRocking-Chairs. No.127888,Patentedluner11,1872."

PATENT OFFICE.

PLATT C. INGERSOLL, OF GREENFINT, NEW YORK.

`lMlfROVEMEblT lN SPRING RCCKING-CHAIRS.

Specification forming part of Letters Patent No. 127,888, dated June 11,-187%.

Specication describing an Improved Spring Rocking-Chair, invented byPLATT C. INGER.- SOLL, of Greenpoint, in the county of Kings and Stateof New York.

' This invention relates to that class of chairs whose seat and backrock on a stationary base or pedestal under the control otl a spring. Itconsists in a novel construction and arrangement of the spring andcombination, with the seat and the stationary base, pedestal, orsupport, of the chair, whereby great eiciency and durability areobtained.

In the accompanying drawing, Figure l is a side View of a chairconstructed according to my invention, and Fig. 2 is a plan of the sametaken iirst above the seat, and showing the upholstery work of thelatter removed.

Similar letters of reference indicate corren sponding parts in bothfigures.

A is the pedestal of the chair, which is of ordinary construction, and Bis the seat to which is rigidly attached the back C, only a portion ofwhich is shown in the drawing. The seat is provided on its under sidewith suitable metal bearing pieces or boxes D D, which receive thejournals of an iron transom, E. This transom is of inverted arc form,and at its :middle is expanded or swelled into a plate-like portion, a,shown more particularly in Fig. 1, and this portion has formed on it apivot, p, on which the seat of the chair turns. G is an iron brace, ofinverted arch form, and which is rigidly attached at its ends to theback and front of the seat at right angles to the transom E, over whichit crosses at or near the middle ot' its lengtliopposite the plate-likeportion a. F is the spring, which is made of wire, and bent `in themiddle of its length to form an elongated bow, r, which is formed atopposite sides of the bow r into two coils, s s, whence its ends b btake a straight and downward direction perpendicular, or nearly so, tothe planeA ofthe bow. The ends t t have screwthreads cut upon them forthe reception of nuts I I. The spring thus constructed is so appliedthat it straddles the brace G of the seat, and that its ends passthrough holes provided for them in the transom E; andthus applied it issecured by the nuts I I being screwed on its ends below the transom insuch manner as to hold the coils upon the transom and give them a rmbearing thereon, and to cause the central portion of the bow to bearupon the brace G. The transom E has provided upon the front portion ofthe part a a bearing, fu, upon which the spring brings the front portionof the brace G, when the back of the seat is notv depressed by theweight of the sitter; and upon the back part of the brace there is astop, e, which comes in contact with the back of the transom to limitthe backward-rocking movement of the seat. In the rocking ot' the seatof the chair the bow 1 of the spring plays on the brace G, and, as theseat is tipped or rocked back, the brace, acting on the bow ofthespring, winds up its coils, and the force so produced effects theforward or return movement of the seat.

The seat of the chair represented, in addition to rocking, is capable ofturning or rotating, but the invention Vis equally applicable to a chairwhose transom E or other equivalent support is rigidly secured to thebase or ped estal, the spring being attached in the same way to the saidsupport, and applied in simi lar relation to the brace G or otherequivalent rigid attachment to the seat.

Claim.

scribed.

P. G. INGERSOLL. Witnesses FRED. HAYNES, R. E. RABEAU.

